The kind of bogus science stuff that floods the internet on a daily basis leads to knowledge that some might consider unnatural. For more examples of "what the fuck are you talking about" given some sort of legitimacy, look up the Channel 5 Will Blunderfield Interview (warning: lots of naked men...
"The penguins were really cute!"
"Nah, you were the cutest."
The smoothest line in this whole manga and it's in a damn Omake chapter are you kidding me
To be fair, little bro didn't exactly want to start this whole regiment to begin with, it was just something that mean girl pushed onto him. Give it a few chapters, and he'll change how he feels, but for right now it's not entirely unreasonable.